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Diketahui titik-titik A ( 2 , − 1 , 4 ) , B ( 4 , 1 , 3 ) , dan C ( 3 , 0 , 5 ) . Tentukan sinus sudut antara vektor AB dan vektor AC .

Diketahui titik-titik . Tentukan sinus sudut antara vektor  dan vektor .

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E. Lestari

Master Teacher

Mahasiswa/Alumni Universitas Sebelas Maret

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sinus sudut antara dan adalah .

sinus sudut antara begin mathsize 14px style AB with rightwards arrow on top end style dan undefined adalah begin mathsize 14px style 1 third square root of 6 end style.

Pembahasan

1. Menentukan vektor 2. Menentukan vektor 3. Menentukan 4. Menentukan 5. Menentukan 6. Menentukan sinus sudut antara dan . cos α = ∣ a ∣ ∣ b ∣ a ⋅ b ​ cos α = ∣ 3 ​ ∣ ∣3∣ 3 ​ cos α = 3 ​ 1 ​ cos α = 3 1 ​ 3 ​ sin α = 3 ​ 2 ​ ​ sin α = 3 1 ​ 6 ​ Jadi, sinus sudut antara dan adalah .

1. Menentukan vektor begin mathsize 14px style AB with rightwards arrow on top end style

begin mathsize 14px style AB with rightwards arrow on top equals open parentheses table row 4 row 1 row 3 end table close parentheses minus open parentheses table row 2 row cell negative 1 end cell row 4 end table close parentheses AB with rightwards arrow on top equals open parentheses table row 2 row 2 row cell negative 1 end cell end table close parentheses end style

2. Menentukan vektor undefined

begin mathsize 14px style AC with rightwards arrow on top equals open parentheses table row 3 row 0 row 5 end table close parentheses minus open parentheses table row 2 row cell negative 1 end cell row 4 end table close parentheses AC with rightwards arrow on top equals open parentheses table row 1 row 1 row 1 end table close parentheses end style

3. Menentukan begin mathsize 14px style AB with rightwards arrow on top times AC with rightwards arrow on top end style

begin mathsize 14px style AB with rightwards arrow on top times AC with rightwards arrow on top equals open parentheses table row 2 row 2 row cell negative 1 end cell end table close parentheses times open parentheses table row 1 row 1 row 1 end table close parentheses AB with rightwards arrow on top times AC with rightwards arrow on top equals 2 plus 2 minus 1 AB with rightwards arrow on top times AC with rightwards arrow on top equals 3 end style

4. Menentukan begin mathsize 14px style open vertical bar AB with rightwards arrow on top close vertical bar end style

begin mathsize 14px style open vertical bar AB with rightwards arrow on top close vertical bar equals square root of 2 squared plus 2 squared plus open parentheses negative 1 close parentheses squared end root vertical line AB with rightwards arrow on top vertical line equals square root of 4 plus 4 plus 1 end root vertical line AB with rightwards arrow on top vertical line equals square root of 9 vertical line AB with rightwards arrow on top vertical line equals 3 end style

5. Menentukan undefined

begin mathsize 14px style open vertical bar AC with rightwards arrow on top close vertical bar equals square root of 1 squared plus 1 squared plus 1 squared end root vertical line AC with rightwards arrow on top vertical line equals square root of 1 plus 1 plus 1 end root vertical line AC with rightwards arrow on top vertical line equals square root of 3 end style

6. Menentukan sinus sudut antara  begin mathsize 14px style AB with rightwards arrow on top end style dan undefined.

Jadi, sinus sudut antara begin mathsize 14px style AB with rightwards arrow on top end style dan undefined adalah begin mathsize 14px style 1 third square root of 6 end style.

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